Research On Control Methods Of Micro-grid With Mobile Power Storages

Distributed Generation(DG) has the characteristics of flexible and dispersion compared with the traditional centralized power, it is the standby with the grid and can improve the reliability of power supply. But the DG also has difficult problems at high cost and control when it is paralleled in the grid. In addition, the DG is a uncontrolled source compared with the grid. So it is limited and isolated by the power system to reduce the impact on the grid. To coordinate the conflict between the DG and the grid, scholars have proposed the concept of micro-grid.In recent years, due to the influence of the energy crisis and the pressure on the environment, the development of electric vehicle is paid more and more attention by the world. But the battery of electric vehicle compared with common battery can be considered as a mobile storage device, the time when the electric vehicles are paralleled in the grid is random, and their capacity is uncertain. And the state when this kind of mobile storage device is paralleled in the grid is duality, which one is load and another is power supply. Therefore, the corresponding control of the electric vehicles when they are paralleled in the grid is necessary.The common used control methods of the DG include current control method, voltage control method and the droop control method. And the control method of micro-grid includes peel-to-peel control, master-slave control and the multi agent control. The paper research on these method and propose the comprehensive control method of the micro-grid with the mobile storage. Besides the paper discuss on the detection of the islanding operation and the control of cutting load of micro-grid, and build the simulation model on the Matlab/simulink.